This standard specifies product varieties, technical requirements, test methods and inspection rules for mining electric drill cables with rated voltage 0.3/0.5kV. This standard applies to rated voltage 0.3/0.5kV mining copper core rubber insulated rubber sheathed electric drill cables. This standard should be used together with GB 12972.1. GB 12972.8-1991 Mining rubber sheathed flexible cables Part 8: Mining electric drill cables with rated voltage 0.3/0.5 kv GB12972.8-1991 Standard download and decompression password: www.bzxz.net

National Standard of the People's Republic of China
Mining Rubber Sheathed Flexible Cables
Part 8: Rated Voltage 0.3/0.5kV
Mining Electric Drill Cables
Flexiblerubber-sheathed cablesforminingpurposesPart 8 :Flexibledrill cables forratedvoltageof0.3/0.5kV
1 Subject content and scope of application
GB12972.8-91
Replaces GB1170--74
This standard specifies the rated Product varieties, technical requirements, test methods and inspection rules for mining electric drill cables with voltage of 0.3/0.5kV. This standard applies to rated voltage 0.3/0.5kV mining copper core rubber insulated rubber sheathed electric drill cables. This standard should be used together with GB12972.1. 2Usage characteristics
2.1 Rated voltage U/U is 0.3/0.5kV.
2.2 The long-term allowable operating temperature of the cable conductor is 65°C. 2.3 The minimum bending radius of the cable is 6 times the cable diameter. 3 model
3.1 cable model is shown in Table 1.
Type
No.
UZ-0.3/0.5
UZP-0.3/0.5
3.2
Name
Mine The electric drill cable
is called
mine shielded electric drill cable
The cable type is shown in Figure 1.
State Bureau of Technical Supervision 1991-06-06 Approved Table 1
Use
Purpose
Power connection for electric drills with rated voltage 0.3/0.5kV and below in coal mines 1992- 03-01Implementation
Specifications
4
UZ-0.3/0.5
GB 12972.8—91
UZP-0.3/0.5
Figure 1
1 - Power core conductor; 2 - Power core insulation; 3 - Semiconducting shielding layer; 4 - Filling core; 5 - Ground core conductor: 6 - Ground core cladding; 7 1. Sheath; 8. Control core conductor; 9. Control core insulated cable specifications should comply with Table 2.
Number of cores × nominal conductor cross-section, mm2
Power wire core
3×2.5
3×4
3×2.5||tt| |3×4
Ground core
1×2.5
1×4
1×2.5
1×4
5 Technical requirements
Control wire core
1×2.5
1×4
Conductor structure
Number/single wire
Nominal diameter
77/0.20
126/0.20
77/0.20
126/0.20
GB12972.8—91
Table 2| |tt||power core
protection
insulation
edge
nominal thickness
1.0
1.0
The technical requirements of 1.0
1.0
5.1 cable shall comply with Table 3 and Table 4. 5.2 Conductor
5.2.1 The single wire in the conductor should be tinned, and the surface of the conductor can be covered with an isolation layer. Note: Discoloration or brittleness of the isolation layer after vulcanization will not be assessed. 5.3 Insulation
Sleeve
Nominal thickness
3.5
3.5
3.5
3.5
Cable outer diameter|| tt||UZ-0.3/0.5
minimum value
17.8
19.1
19.1
20.5
5.3.1 power core The insulation of the control wire core should comply with the XJ-00A regulations in GB7594.2. 5.3.2 If the ground core has an insulating coating, it should comply with the XJ-00A regulations in GB7594.2. 5.3.3 The insulation shield adopts the Class A structure in Table 5 of GB12972.1. 5.4 Cable core
5.4.1 The position of the control wire core complies with the provisions of Article 7.2c of GB12972.1. 5.4.2 The position of the ground core complies with the requirements of GB12972.1 Article 7.4b. 5.4.3 The stranded pitch diameter ratio of the cable core should not be greater than 5. 5.5 Sheath
5.5.1 The sheath is a single-layer structure, and its performance complies with the XH-03A regulations in GB7594.7. 6 Test and inspection rules
Products are tested according to Table 3 and Table 4.
Table 3
Nominal cross-section of power wire core
mm
2.5
4
Insulation resistance at 20℃||tt| |MO·km minimum value
160
160
maximum value
19.6
21.0
21.0
22.6| |tt||mm
UZP-0.3/0.5
maximum value
minimum value
19.4
20.8
20.9||tt ||22.4
20℃ conductor DC resistance
a/km maximum value
8.83
5.39
22.2
23.6||tt ||23.8
25.5
Serial number
1
1.1
1.2Www.bzxZ.net
1.3
1.4
1.5
1.6
2
2.1
2.2
2.3
2.4
2.5
2.6| |tt||2.7
3
4
Project name
Structural dimensions
Conductor
Insulation thickness
Shielding Layer
Cable core
Sheath thickness
Cable outer diameter
Cable performance
Conductor resistance
Insulation resistance
Transition resistance
power frequency AC voltage
test
combustion test
insulation physical machinery
performance
sheath physical machinery||tt ||Performance
Identification mark
Delivery length
GB 12972.8-91
Table 4
Technical requirements
Chapter 5.2 of this standard Article and Table 2
GB12972.1 Article 5.2 and this standard Table 2
This standard Article 5.3.3
GB12972.1 Article 7 and this standard GB12972 .1 Article 8 and Table 2 of this standard
Table 2 of this standard
Table 3 of this standard
Table 3 of this standard
Not more than 1kQ (not applicable to UZ -0.3/0.5) GB12972.1 Table 8
GB12972.1 Article 11.6
Article 5.3 of this standard
Article 5.5 of this standard
GB12972.1 Article 10
GB12972.1 Article 11.12
Note: St means periodic testing, which should be conducted at least once a year. Additional notes:
This standard is proposed by the Ministry of Mechanical and Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the Shanghai Cable Research Institute of the Ministry of Mechanical and Electronic Industry. Test type
T,s
T,s
T,s
T,s
T,s
T,s
T,R
T,R
T,s
T,R
T,St
T,St|| tt||T,St
T,s
R
Test method
GB4909.2
GB2951.2
Visual inspection
Visual inspection of twist direction
GB2951.3
GB2951.4
GB3048.4
GB3048.5
GB12972.1 Appendix D
GB3048.8
GB12666.2 | | tt | Branch hospitals and other units are responsible for drafting. The main drafters of this standard are Liu Fenglin and Tang Kaizong.
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